Johnson, J. A. (1963). Group therapy: A practical approach. Blakiston Division, McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Johnson, James A. Group Therapy: A Practical Approach. New York: Blakiston Division, McGraw-Hill, 1963.
Lua MLA (9ú heag.)Johnson, James A. Group Therapy: A Practical Approach. Blakiston Division, McGraw-Hill, 1963.
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